Refactor template placeholders for repository name.

Updated rootProject.name and JDBC URL configuration to use template placeholders for better flexibility and consistency. Removed unused code and initialization block from Database.kt to improve readability and maintainability.

settings.gradle.kts

@@ -1,5 +1,4 @@
 plugins {
   id("org.gradle.toolchains.foojay-resolver-convention") version "0.5.0"
 }
-//var REPO_NAME = "template"
-rootProject.name = "${REPO_NAME}"
+rootProject.name = "{{.RepoName}}"